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  1. kenshin305

    Heat Treated Stainless 440C Hole Saw Shattering. HELP!

    Racookpe, Attached are some images I took with my iPhone 6 and a DSLR camera. I don’t have the best lens for this. Hopefully these are the angles you requested. Any input would be greatly appreciated. Thank you.
  2. kenshin305

    Heat Treated Stainless 440C Hole Saw Shattering. HELP!

    Mike, By increasing the amount of teeth, I can decrease the height of the “cup” section. I want to go from 24 teeth to 36 teeth. Attached is an image of a hole saw I created with a 1/16” TiAlN endmill. On the mill, I used an indexing head and rotated the vice 60 degrees clockwise, and then 60...
  3. kenshin305

    Heat Treated Stainless 440C Hole Saw Shattering. HELP!

    hydtools, that's genius. I could do it in the mill using a small carbide endmill and an indexing head. I could still use my v-cutter without trying to customize it. Thank you.
  4. kenshin305

    Heat Treated Stainless 440C Hole Saw Shattering. HELP!

    ornerynorsk, I will temper at a higher temperature. I didn't realize that I could laser harden the edges, so I will look into that. dgallup, I was looking at both stainless 420 and 17-4 PH. What do you guys think about induction hardening? Many of the hand saws in Home Depot are done this way...
  5. kenshin305

    Heat Treated Stainless 440C Hole Saw Shattering. HELP!

    I also noticed the break starting at the V root. The 60 degree tooth profile works best for me, but I can’t find a 60 degree cutter with a radius. I may have to customize one. I will try tempering at 500 degrees C. Do you think the 30 minute heat treatment at 1038 degrees C is too long for such...
  6. kenshin305

    Heat Treated Stainless 440C Hole Saw Shattering. HELP!

    Hello, I’m an industrial engineering undergrad who is making my own stainless 440C hole saws from 1 inch OD round bar. Using a lathe, I drilled, reamed, and finally used a boring bar to get the wall thickness to 0.021” (I know, it’s very thin). I then used a mill and a v-cutter to machine the...

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